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Tremron Home Additions & ADU: The Santa Clarita Owner’s Guide
A Tremron home addition or ADU in Santa Clarita typically runs $45,000 to $130,000 installed, depending on square footage, foundation work, and finish level. We plan, permit, and build these projects from the first stake to the final inspection, so the price you approve is the price you pay. Most owners call us after a smaller remodel exposed framing or drainage problems at the back of the house, or after realizing the garage they planned to convert sits on a slab that won’t carry a second story without help.
Which Tremron Models This Applies To
Tremron isn’t a single product line. In Santa Clarita, we see Tremron concrete pavers and retaining wall block used as the hardscape foundation around many additions and ADUs. The pavers come in multiple thicknesses: 60mm for foot traffic, 80mm for driveways, and 100mm for heavy vehicle loads. The retaining wall block runs from the small Ashlar series up to the large Diamond Pro units. When you’re adding square footage, the ground around the new foundation has to be re-compacted and re-laid, and that’s where Tremron-compatible materials show up most often. The critical compatibility gotcha: if your existing patio or walkway is 60mm paver and you’re extending it around a new ADU with any vehicle access, you need to step up to 80mm or the pavers will shift and crack within the first winter. For the structure itself, we build to Santa Clarita code with standard engineered lumber, Simpson ties, and whatever foundation type the soil report calls for. Tremron block is not structural for a dwelling; it retains and finishes the landscape around it.
Styles & brands we work with
Signs Your Tremron Home Additions & ADU Is Failing
- Paver edges are sinking or spreading near the existing slab. This usually means the base material was never compacted properly or water is washing fines out from under the edge. You’ll see a visible dip within 18 months if the subgrade wasn’t right.
- Retaining wall block is leaning or bulging outward. In Santa Clarita’s clay-heavy soil, water builds up behind walls after winter rains and pushes them out. A wall leaning more than an inch per foot of height needs a drainage fix, not just a reset.
- Cracks in the existing slab or stem wall where the addition will tie in. Differential settling means the old slab and new addition will move independently. We check for this before any framing goes up, because it changes the foundation design.
- Drainage that runs toward the house instead of away. After a few Santa Clarita storms, water pooling against the new ADU’s foundation will find its way in. This is the most common cause of musty smells and efflorescence on the block.
- Doors and windows in the existing home start sticking after the addition. That’s often cosmetic settling, but if it continues past the first year, the foundation likely needs a closer look.
See the difference
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After
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After
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AfterReplacement Cost & What’s Included
For a full home addition in Santa Clarita, budget $45,000 to $130,000 depending on size and complexity. A garage conversion lands lower, around $30,000 to $80,000, while a detached ADU from scratch starts near $90,000 and can run to $220,000 once you factor in utility connections and site work. What drives the range: slab condition, soil type, whether we’re adding a bathroom or kitchen, and how much hardscape has to come out and go back. Every quote we write includes the written line-item price before work starts. No change orders unless you ask for one. The 365-Day Done Right Promise covers our workmanship for a full year after the job closes.
DIY or Call Us?
You can reset a few sunken pavers yourself if you’re patient and have a level and a rubber mallet. You can also re-grade a small section of garden bed. What you shouldn’t do is touch a retaining wall taller than three feet, cut into an existing foundation, or run new electrical to a detached structure. Those jobs carry real risk: a wall failure can collapse onto a person, and an undersized electrical feed can overheat. If you’re not sure, call us at (661) 592-1977 and we’ll tell you straight whether it’s something you can handle or something that needs a permit and a crew.
FAQs
A properly built addition in Santa Clarita should last 50 to 80 years before major structural work. The hardscape around it, if the base is compacted and drainage is correct, will hold for 25 to 40 years before paver replacement or wall resets are needed. If the base was never right, you’ll know within two winters. Call (661) 592-1977 if the ground around your addition is already moving.
Most of the time, the failing part isn’t the structure, it’s what surrounds or supports it. We can reset pavers, install drainage behind retaining walls, and reinforce a stem wall without tearing down the whole project. Full replacement only happens when the foundation itself is compromised or the framing has moisture damage. We’ll show you the evidence before we quote anything, and estimates are free.
A standard single-room addition runs 8 to 14 weeks after permits are pulled. A full ADU can take 4 to 8 months, mostly because of utility connections and inspections. Permits in Santa Clarita usually take 4 to 8 weeks before we break ground. We give you a written schedule with your quote, and that schedule includes live arrival time tracking on every workday.
We keep common Tremron-compatible pavers, retaining wall block, drainage pipe, and framing materials stocked on the truck for most Santa Clarita jobs. For larger orders or specific colors, we place the order with the local supplier and have it on site the same week. Call (661) 592-1977 with your color and series, and we’ll confirm availability before you sign anything.
Written by Luca Romano, Owner, Sawyer Remodel Santa Clarita at Sawyer Remodel Santa Clarita, serving Santa Clarita and nearby areas.
